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建立了机载并行双站斜视合成孔径雷达(SAR)的几何模型,给出了雷达回波的数学表达式,推导了它的二维频谱并对其特点做了分析。在二维频域内,先用聚焦函数对观测场景中心的点目标做精确成像,然后用Chirp-Z变换(CZT)校正中心点两侧目标回波的距离徙动,再通过方位向逆傅里叶变换得到了雷达图像。该算法利用了CZT能够处理非线性调频信号的特点,简化了处理过程,提高了计算效率和成像精度。仿真实验验证了这种基于CZT的新算法在处理并行双站斜视SAR数据时的有效性。
The geometrical model of airborne parallel dual station strabismus synthetic aperture radar (SAR) is established. The mathematical expression of radar echo is given. Its two-dimensional spectrum is deduced and its characteristics are analyzed. In the two-dimensional frequency domain, the focal point of the observation scene is first accurately mapped by the focus function, then the Chirp-Z transform (CZT) is used to correct the distance of the target echo on both sides of the center, Leaf transform obtained radar image. The algorithm takes advantage of CZT’s ability to process nonlinear FM signals, simplifies the process and improves computational efficiency and imaging accuracy. Simulation experiments verify the effectiveness of the new CZT-based algorithm in processing parallel bi-station strabismic SAR data.